HEIDENHAIN MANUALplus 620 Technical Manual page 1763

9.4 The USB Interface of the Control (USB 2.0)
January 2012
The USB interface is a standard serial interface.
(USB = Universal Serial Bus)
USB 1.1 provides a maximum data transfer rate of 12 Mbps.
Various USB block devices, such as keyboard, mouse, external hard disks, and
USB memory sticks, can be connected to the control via the USB interface
(X141, X142).
Note
If USB components require more than 0.5 A, a separate power supply
becomes necessary for these components. One possibility is the USB hub
from HEIDENHAIN (368 735-01).
The USB interface features the "hot-plug capability." This means that you can
connect USB devices to the USB interface and remove them, without having
to shut down and then restart the control.
Transmission distance without hub: Up to 6 meters
Note
For greater transmission distances, you must use a USB hub after every six
meters in order to amplify the signal. You can use more than one hub for
one transmission distance. USB cables with a length of up to 30 meters
(with 5 integrated USB hubs) are available from HEIDENHAIN under ID 624
775-xx.
9.4 The USB Interface of the Control (USB 2.0) 1763